"""
重新设计的战场系统
符合KARDS真实的3条战线布局：玩家1支援线 - 共用前线 - 玩家2支援线
"""
from typing import List, Optional, Dict, Tuple, Union
from dataclasses import dataclass
from uuid import UUID

from ..core.enums import LineType
from ..units.unit import Unit


@dataclass  
class HQ:
    """总部类 - 作为支援线上的特殊目标"""
    defense: int = 20
    current_defense: int = 20
    player_id: str = ""
    position_index: int = 2  # HQ默认在支援线中间位置
    
    def take_damage(self, damage: int) -> int:
        """总部受到伤害"""
        actual_damage = min(damage, self.current_defense)
        self.current_defense -= actual_damage
        return actual_damage
    
    def is_destroyed(self) -> bool:
        """判断总部是否被摧毁"""
        return self.current_defense <= 0
    
    def __str__(self) -> str:
        return f"HQ ({self.current_defense}/{self.defense})"


class BattleLine:
    """战线类 - 支持单位和HQ的紧凑排列"""
    
    def __init__(self, line_type: LineType, max_objectives: int = 5, hq: Optional[HQ] = None):
        self.line_type = line_type
        self.max_objectives = max_objectives
        self.objectives: List[Optional[Union[Unit, HQ]]] = []  # 紧凑排列的目标
        
        # 如果有HQ，放在中间位置
        if hq:
            self.objectives.append(hq)
            hq.position_index = 0
    
    def add_unit(self, unit: Unit) -> bool:
        """添加单位到战线（自动紧凑排列）"""
        if len(self.objectives) >= self.max_objectives:
            return False  # 战线已满
        
        self.objectives.append(unit)
        unit.position = (self.line_type, len(self.objectives) - 1)
        
        # 检查烟幕条件
        unit.check_smokescreen_conditions()
        
        return True
    
    def get_hq(self) -> Optional[HQ]:
        """获取战线上的HQ"""
        for obj in self.objectives:
            if isinstance(obj, HQ):
                return obj
        return None
    
    def get_units(self) -> List[Unit]:
        """获取战线上的所有单位（不包括HQ）"""
        units = []
        for obj in self.objectives:
            if isinstance(obj, Unit):
                units.append(obj)
        return units
    
    def remove_unit(self, unit: Unit) -> bool:
        """移除单位并重新排列"""
        try:
            index = self.objectives.index(unit)
            self.objectives.pop(index)
            unit.position = None
            
            # 重新分配位置索引
            self._reindex_objectives()
            return True
        except ValueError:
            return False
    
    def _reindex_objectives(self) -> None:
        """重新分配所有目标的位置索引"""
        for i, obj in enumerate(self.objectives):
            if isinstance(obj, Unit):
                obj.position = (self.line_type, i)
                # 重新索引后检查烟幕条件
                obj.check_smokescreen_conditions()
            elif isinstance(obj, HQ):
                obj.position_index = i
    
    def get_unit_at_index(self, index: int) -> Optional[Union[Unit, HQ]]:
        """获取指定索引位置的目标"""
        if 0 <= index < len(self.objectives):
            return self.objectives[index]
        return None
    
    def get_all_units(self) -> List[Unit]:
        """获取战线上所有单位（不包括HQ）"""
        return [obj for obj in self.objectives if isinstance(obj, Unit)]
    
    def get_all_objectives(self) -> List[Union[Unit, HQ]]:
        """获取战线上所有目标（包括单位和HQ）"""
        return self.objectives.copy()
    
    def find_unit_index(self, unit: Unit) -> Optional[int]:
        """查找单位的索引位置"""
        try:
            return self.objectives.index(unit)
        except ValueError:
            return None
    
    def get_adjacent_indices(self, index: int) -> List[int]:
        """获取相邻位置的索引"""
        adjacent = []
        if index > 0:
            adjacent.append(index - 1)
        if index < len(self.objectives) - 1:
            adjacent.append(index + 1)
        return adjacent
    
    def get_adjacent_objectives(self, index: int) -> List[Union[Unit, HQ]]:
        """获取相邻的目标"""
        adjacent_indices = self.get_adjacent_indices(index)
        return [self.objectives[i] for i in adjacent_indices]
    
    def is_full(self) -> bool:
        """检查战线是否已满"""
        return len(self.objectives) >= self.max_objectives
    
    def is_empty(self) -> bool:
        """检查战线是否为空"""
        return len(self.objectives) == 0
    
    def get_objective_count(self) -> int:
        """获取目标数量"""
        return len(self.objectives)
    
    def __str__(self) -> str:
        if not self.objectives:
            return f"{self.line_type}: [空]"
        
        obj_strs = []
        for i, obj in enumerate(self.objectives):
            if isinstance(obj, Unit):
                obj_strs.append(f"{i}:{obj.name}")
            elif isinstance(obj, HQ):
                obj_strs.append(f"{i}:HQ")
            else:
                obj_strs.append(f"{i}:未知")
        
        return f"{self.line_type}: [{', '.join(obj_strs)}]"


class Battlefield:
    """重新设计的战场类 - 3条战线布局"""
    
    def __init__(self, player1_id: str, player2_id: str):
        # 玩家信息
        self.player1_id = player1_id
        self.player2_id = player2_id
        
        # 创建HQ
        self.player1_hq = HQ(player_id=player1_id)
        self.player2_hq = HQ(player_id=player2_id)
        
        # 创建3条战线
        self.player1_support = BattleLine(LineType.PLAYER1_SUPPORT, hq=self.player1_hq)
        self.front_line = BattleLine(LineType.FRONT)  # 共用前线，无HQ
        self.player2_support = BattleLine(LineType.PLAYER2_SUPPORT, hq=self.player2_hq)
        
        # 单位快速查找索引
        self.unit_registry: Dict[UUID, Unit] = {}
        
        # 前线控制权（None表示无人控制）
        self.front_line_controller: Optional[str] = None
    
    def get_player_hq(self, player_id: str) -> Optional[HQ]:
        """获取玩家的HQ"""
        if player_id == self.player1_id:
            return self.player1_hq
        elif player_id == self.player2_id:
            return self.player2_hq
        return None
    
    def get_player_support_line(self, player_id: str) -> Optional[BattleLine]:
        """获取玩家的支援线"""
        if player_id == self.player1_id:
            return self.player1_support
        elif player_id == self.player2_id:
            return self.player2_support
        return None
    
    def get_line_by_type(self, line_type: LineType) -> Optional[BattleLine]:
        """根据类型获取战线"""
        if line_type == LineType.PLAYER1_SUPPORT:
            return self.player1_support
        elif line_type == LineType.FRONT:
            return self.front_line
        elif line_type == LineType.PLAYER2_SUPPORT:
            return self.player2_support
        return None
    
    def deploy_unit_to_support(self, unit: Unit, player_id: str) -> bool:
        """部署单位到玩家支援线"""
        support_line = self.get_player_support_line(player_id)
        if not support_line:
            return False
        
        if support_line.add_unit(unit):
            unit.owner = player_id
            self.unit_registry[unit.id] = unit
            return True
        return False
    
    def deploy_unit_to_front(self, unit: Unit, player_id: str) -> bool:
        """部署单位到前线"""
        if self.front_line.add_unit(unit):
            unit.owner = player_id
            self.unit_registry[unit.id] = unit
            
            # 更新前线控制权
            self._update_front_line_control()
            return True
        return False
    
    def _update_front_line_control(self) -> None:
        """更新前线控制权"""
        units = self.front_line.get_all_units()
        if not units:
            self.front_line_controller = None
            return
        
        # 检查前线上的单位是否都属于同一玩家
        owners = set(unit.owner for unit in units)
        if len(owners) == 1:
            self.front_line_controller = list(owners)[0]
        else:
            self.front_line_controller = None  # 混合控制或争夺中
    
    def remove_unit(self, unit: Unit) -> bool:
        """从战场移除单位"""
        if not unit.position:
            return False
        
        line_type, _ = unit.position
        battle_line = self.get_line_by_type(line_type)
        
        if battle_line and battle_line.remove_unit(unit):
            if unit.id in self.unit_registry:
                del self.unit_registry[unit.id]
            
            # 如果是前线单位，更新控制权
            if line_type == LineType.FRONT:
                self._update_front_line_control()
            
            return True
        return False
    
    def get_all_units(self, player_id: Optional[str] = None) -> List[Unit]:
        """获取所有单位，可按玩家筛选"""
        all_units = []
        
        # 收集所有战线的单位
        for line in [self.player1_support, self.front_line, self.player2_support]:
            all_units.extend(line.get_all_units())
        
        # 按玩家筛选
        if player_id:
            all_units = [unit for unit in all_units if unit.owner == player_id]
        
        return all_units
    
    def find_unit(self, unit_id: UUID) -> Optional[Unit]:
        """通过ID查找单位"""
        return self.unit_registry.get(unit_id)
    
    def get_units_with_keyword(self, keyword: str, player_id: Optional[str] = None) -> List[Unit]:
        """获取具有特定关键词的所有单位"""
        units = self.get_all_units(player_id)
        return [unit for unit in units if unit.has_keyword(keyword)]
    
    def is_game_over(self) -> Tuple[bool, Optional[str]]:
        """检查游戏是否结束，返回(是否结束, 胜利者ID)"""
        if self.player1_hq.is_destroyed():
            return True, self.player2_id
        elif self.player2_hq.is_destroyed():
            return True, self.player1_id
        return False, None
    
    def get_valid_attack_targets_for_unit(self, attacker: Unit) -> List[Union[Unit, HQ]]:
        """获取单位可以攻击的所有目标"""
        if not attacker.owner or not attacker.position:
            return []
        
        valid_targets = []
        attacker_line, attacker_index = attacker.position
        
        # 根据单位类型和位置确定攻击规则
        if attacker.unit_type.name == "ARTILLERY":
            # 火炮可以攻击任意敌方目标
            valid_targets = self._get_all_enemy_objectives(attacker.owner)
            
        elif attacker.unit_type.name in ["FIGHTER", "BOMBER"]:
            # 飞机可以攻击任意敌方目标
            valid_targets = self._get_all_enemy_objectives(attacker.owner)
            
        else:
            # 常规单位攻击规则
            if attacker_line == LineType.FRONT:
                # 前线单位可以攻击敌方支援线
                enemy_id = self.get_enemy_player_id(attacker.owner)
                enemy_support = self.get_player_support_line(enemy_id)
                if enemy_support:
                    valid_targets = enemy_support.get_all_objectives()
                    
            else:
                # 支援线单位只能攻击前线单位
                front_units = self.front_line.get_all_units()
                enemy_units = [u for u in front_units if u.owner != attacker.owner]
                valid_targets = enemy_units
        
        # 应用守护等规则过滤目标
        return self._filter_protected_targets(valid_targets, attacker)
    
    def _get_all_enemy_objectives(self, player_id: str) -> List[Union[Unit, HQ]]:
        """获取所有敌方目标（单位+HQ）"""
        enemy_id = self.get_enemy_player_id(player_id)
        if not enemy_id:
            return []
        
        targets = []
        
        # 敌方支援线目标
        enemy_support = self.get_player_support_line(enemy_id)
        if enemy_support:
            targets.extend(enemy_support.get_all_objectives())
        
        # 前线敌方单位
        front_units = self.front_line.get_all_units()
        enemy_front_units = [u for u in front_units if u.owner == enemy_id]
        targets.extend(enemy_front_units)
        
        return targets
    
    def _filter_protected_targets(self, targets: List[Union[Unit, HQ]], 
                                attacker: Unit) -> List[Union[Unit, HQ]]:
        """过滤受保护的目标"""
        valid_targets = []
        
        for target in targets:
            can_attack = True
            
            if isinstance(target, Unit):
                # 检查烟幕保护
                if target.has_keyword("SMOKESCREEN"):
                    can_attack = False
                
                # 检查守护保护
                if self._is_target_guarded(target) and attacker.unit_type.name not in ["BOMBER", "ARTILLERY"]:
                    can_attack = False
            
            if can_attack:
                valid_targets.append(target)
        
        return valid_targets
    
    def _is_target_guarded(self, target: Union[Unit, HQ]) -> bool:
        """检查目标是否被守护"""
        if not isinstance(target, Unit) or not target.position:
            return False
        
        line_type, target_index = target.position
        battle_line = self.get_line_by_type(line_type)
        if not battle_line:
            return False
        
        # 检查相邻位置是否有守护单位
        adjacent_objectives = battle_line.get_adjacent_objectives(target_index)
        for obj in adjacent_objectives:
            if isinstance(obj, Unit) and obj.has_keyword("GUARD"):
                return True
        
        return False
    
    def get_enemy_player_id(self, player_id: str) -> Optional[str]:
        """获取敌方玩家ID"""
        if player_id == self.player1_id:
            return self.player2_id
        elif player_id == self.player2_id:
            return self.player1_id
        return None
    
    def __str__(self) -> str:
        front_control = f" (控制: {self.front_line_controller})" if self.front_line_controller else " (无人控制)"
        
        return f"""
=== 战场状态 ===
{self.player1_support}
{self.front_line}{front_control}
{self.player2_support}
==================
        """